I just took my ST-6 to field day last week...still working OK despite it getting jostled around (I do check the cards from time to time).

I also noted how awesome it is for not printing a bunch of gibberish on no signal, unlike certain other military-esque converters ;-)

(and then noticed how much of a PITA it is trying to tune in a RTTY station with how sharp the filters are)

Jeff

On Tue, Jun 25, 2024 at 5:45 PM W2HX <w2hx@w2hx.com> wrote:

Hey all, Just resurrecting an old post from April. I went ahead and built a project for this external loop supply, went a little overboard, but isn’t that the fun of it?

I made two videos of the project if you’re interested.

 

https://youtu.be/d-nGXodtDTs

and part 2

https://youtu.be/RUj7JqochpM

 

73 Eugene W2HX
My Youtube Channel: https://www.youtube.com/@w2hx/videos

 

From: greenkeys-bounces@mailman.qth.net <greenkeys-bounces@mailman.qth.net> On Behalf Of W2HX
Sent: Monday, April 8, 2024 7:44 PM
To: Greenkeys <greenkeys@mailman.qth.net>
Subject: [GreenKeys] Loop supplies/ST-6?

 

Hi all

 

For many years, I’ve used my ST-6 as my TU with its built-in loop supply. These days as I am using a different TU for the 850 shift stuff. I still use my ST-6 but in STDBY (mark hold) mode just to have it supply loop current to the equipment as my CV-2460 expects and external loop supply (but not use the ST-6 as a TU for 850 Hz).

 

The number of machines on the loop has grown and therefore has been reducing the current that is able to be supplied by the ST-6 as I don’t think it was meant to handle more than a few devices. I have maxed out the rheostat in the ST6 (or minimized it as is the case). So I acquired a navy loop supply, designation PP-3495A (attached) that can supply 120VDC at a full 1A output.

 

I was wondering if anyone has modified an ST-6 to disable its internal loop supply and allow it to be used with an external supply? This way I can use one loop supply regardless of which TU/CV I am using to drive the loop (of course, the unused TU/CV would have to be in bypass/standby/mark-hold mode).

 

Thanks

 

 

73 Eugene W2HX
My Youtube Channel: https://www.youtube.com/@w2hx/videos

 

 

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